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1.无图像(1)检查电源是否正常。由正电输入端开始向后逐次检查电源部分各元器件的电压是否正常,是否有电器某个部分对地短路,从而造成电源过载,电源某个元件是否发烫,电压输出是否不正常。(2)检查低噪声放大器工作点是否正常。检查高频滤波电容有无短路,偏置微型电阻有无损坏及偏置高阻线有无断开现象。以上均未发现异常时,应考虑检查场效应管是否损坏。
1. No image (1) Check the power is normal. From the positive input back to the beginning and then check the power part of the voltage of each component is normal, whether there is a part of the electrical short circuit to ground, resulting in power overload, the power of a component is hot, the voltage output is not normal. (2) check the low noise amplifier operating point is normal. Check the high-frequency filter capacitor is short-circuited, biased micro-resistor without damage and offset high-impedance line with or without breaking phenomenon. None of the above anomalies should be considered to check whether the FET is damaged.